Unidirectional Force Research Articles

Performance of tapping washing in comparison with hand washing and front-loading machine washing for knitted wool sweaters

Wool fiber is widely used for clothing in our daily life due to its excellent physical and mechanical properties. However, in the daily laundry process, wool products can shrink severely by strong mechanical action in a warm and moist environment due to the fiber surface scales. Aiming to overcome the difficulty of washing delicate clothes such as wool and silk, Panasonic Intellectual Property Management Co. Ltd. invented a new washing machine for delicate clothes, based on tapping actions. The washing performance of wool sweaters in tapping washing is compared with that of hand washing and gentle and normal machine washing. The results show that tapping washing always gives wool sweaters the best appearance, dimensional stability and mechanical property up to 10 washing cycles. The changes in appearance and mechanical properties of wool sweaters are mainly due to the rate of felting shrinkage. By comparing the magnitude, duration, number of mechanical actions and direction of the forces acting on the fabric in tapping washing, hand washing and gentle machine washing, it can be concluded that the direction of forces acting on the fabric has a significant effect on wool fabric felting shrinkage, and unidirectional force has less effect on felting shrinkage than multidirectional forces. Tapping washing can give the lowest felting rate to wool samples because the forces in tapping washing on all parts of the fabric have a similar direction.

Patterning of organic semiconductor crystal arrays via microchannel-assisted inkjet printing for organic field-effect transistors

Inkjet printing technique provides a low-cost way for large-area construction of the patterned organic semiconductors toward integrated organic electronics. However, because of a lack of control over the wetting and dewetting dynamics of organic inks, inkjet-printed organic semiconductor crystals (OSCCs) are frequently plagued by the ‘coffee ring’ effect and uncontrollable growth process, leading to an uneven crystal morphology and disordered orientation. Here, we report a universal microchannel-assisted inkjet printing (MA-IJP) method for patterning of OSCC arrays with ordered crystallographic orientation. The micro-sized channel template not only provides a unidirectional capillary force to guide the wetting process of organic inks, but also confines the evaporation-induced dewetting behavior, enabling the long-range ordered growth of OSCCs. The patterned 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) crystals present one-dimensional structures with a pure (010) crystallographic orientation. The 7 × 7 discrete organic field-effect transistor array made from the patterned C8-BTBT crystals exhibits a high average mobility up to 3.23 cm2 V−1 s−1 with a maximum mobility of 5.36 cm2 V−1 s−1. Given the good generality of the patterning process and high quality of the obtained OSCC crystal array, it is anticipated that our MA-IJP approach will constitute a major step toward integrated electronic and optoelectronic devices.

Design and Testing of Hydraulic Actuator in Typical Areospace Vehicle

Abstract: A hydraulic actuator is a mechanical actuator that is used to impart a unidirectional force through a unidirectional stroke. The detailed study of various control actuations and design of typical hydraulic actuation system is need as it plays a major role in the working of aerospace vehicle. This study involves the design of hydraulic actuation system for the flex nozzle of a solid motor as part of thrust vector control actuation system. This actuation system is going to control the vehicle in pitch and yaw direction during powered phase. The design, fabrication and testing of the hydraulic actuator are considered in this work. After designing the hydraulic actuator according to the specifications, testing is done manually, to check the performance of the vehicle by using different techniques. The actuator which is designed, fabricated and tested successfully is ready to be fitted in the aerospace vehicle.

Analytical Model of Piezoresistivity for an Inner-Adhesive-Type Carbon Fibre Reinforced Plastic Tunnel Reinforcement.

Cracks in a tunnel lining often emerge under the coupling action of earth and water pressures in a complex stratum environment, and accidents often occur in the process of repairing cracks. In this study, we used the force-sensitive properties of embedded carbon fibre to conduct early-warning research on lining reinforcement to prevent secondary damage during tunnel lining reinforcement. According to the earth load characteristics, a bond stress–slip model of the embedded carbon fibre under bidirectional earth pressure was established on the basis of the thick-walled cylinder theory and the semi-inverse method in elastic theory. The length change of a single fibre was obtained on the basis of the principle that the volume of a single carbon fibre is constant during the deformation process. The resistance and strain model of the single carbon fibre under the action of an external force was then established following the relationship between the resistance, the length change and the volume change of the single carbon fibre. The resistance of carbon fibre composite materials, according to their production technology and unidirectional force properties, was assumed to be a mixture of the series and parallel resistances of the single carbon fibre, and a piezoresistive model of carbon fibre composite materials was formed by using the multidimensional Taylor series expansion and the idea of the average equivalent. The comparison between the theoretical and monitoring values of the piezoresistive model in a tunnel project in Tibet, China revealed that the resistance of various types of carbon fibres increases with the radius of the lining reinforcement and earth pressure and decreases with an increase in the lining reinforcement thickness. Meanwhile, the angles at different positions of the lining reinforcement also have certain effects on the resistance value of the carbon fibre. The variation curve of the piezoresistive model was exponential in both deeply and shallowly buried tunnels, which verifies the rationality of the model.

Aramid Nanofibers Aerogel‐filled Wood‐based Carbon Material for Flexible Solid Supercapacitors

AbstractDelignified wood‐based carbon material is a potential cost‐effective and environmentally‐friendly flexible electrode material. However, the abundant intertubular cavities not only endow excellent flexibility, but also inevitably deteriorate the conductivity, integrity and areal density of the delignified wood‐based flexible carbon material, which is not conducive to improve the energy storage performance. In this work, an aramid nanofiber‐based carbon aerogel was filled in the intertubular cavities via a series of processes, including filled by virtue of the unidirectional capillary forces, gelation, freeze‐drying and carbonization. The filled carbon aerogel can significantly increase the conductivity and the sheet resistance is as low as about 28±5 Ω sq−1. The filled carbon aerogel does not deteriorate its excellent energy storage behavior derived from the unique low‐tortuosity and open slender tubular microstructure. The filled carbon aerogel can improve the space utilization of the delignified wood‐based carbon. The areal specific capacitance has been increased from 20.8 to 51.9 mF cm−2 at a current density of 50 μA cm−2. The area specific capacitance still remains at 33.9 mF cm−2 when the current density increased to 1000 μA cm−2. The aramid nanofibers aerogel‐filled wood‐based carbon flexible interdigitated solid supercapacitors also exhibit excellent flexibility and folding endurance.

Parallel wire-driven system and Musculoskeletal system

This paper focuses on a parallel wire-driven system and a musculoskeletal system which have a multi-degree-of-freedom mechanism driven by unidirectional forces. The characteristics and applications of the parallel wire-driven system are described. After pointing out the analogy between the two systems, the musculoskeletal potential method is explained.

Comparison Between Cotton Test and Tap Test for the Assessment of Coronal Syndesmotic Instability: A Cadaveric Study

Category:Ankle; Basic Sciences/Biologics; Sports; TraumaIntroduction/Purpose:Diagnosis of subtle instability of the distal tibiofibular syndesmosis is challenging. In surgically treated rotational malleolar fractures, instability is typically assessed with the intraoperative Cotton test. However, this test can be unreliable due to its dynamic nature and uncontrolled distraction force. The Tap test is an alternative test where a cortical tap is advanced through the fibula with a progressive, stable, and unidirectional distraction force. The objective of this cadaveric study was to compare the DTFS widening when using the Cotton and Tap tests as diagnostic tools for coronal plane syndesmotic instability.Methods:Ten below-knee cadaveric specimens were tested in intact non-stressed, intact stressed, injured non-stressed, and injured stressed conditions, with stressed conditions utilizing both Cotton and Tap tests. In injured conditions, the syndesmotic ligamentous complex was sectioned (anterolateral longitudinal approach). Perfect fluoroscopic Mortise images were acquired for all conditions. For the Tap test, a 2.5 drill bit was used to drill a hole through both distal fibular cortices. A blunt-edged 3.5mm cortical tap was advanced toward the tibia. For the Cotton test, a lateral distraction force was applied to the distal fibula with a towel clamp. Two observers measured Tibiofibular Clear Space (TFCS) 1cm proximal to the ankle joint line. Intra and interobserver reliabilities were assessed by Intraclass Correlation Coefficient (ICC). Syndesmotic TFCS values for all conditions were compared by paired Wilcoxon. Diagnostic performance of the Cotton and Tap tests was assessed (a relative increase of TFCS>2mm). P-values <0.05 were considered significant.Results:The intraclass correlation coefficient (ICC) for intraobserver and interobserver reliability was respectively, 0.96 and 0.78.TFCS measurements were similar in intact non-stressed, intact stressed (both Cotton and Tap tests) and injured non- stressed conditions: intact non-stressed, 3.5mm (CI, 3.0 to 3.9mm); intact stressed, 3.6mm (CI, 3.1 to 4.1mm) (Cotton test) and 4.0mm (CI, 3.5 to 4.5mm) (Tap test); injured non-stressed, 3.8mm (CI, 3.3 to 4.3mm). TFCS was significantly increased (p<0.0001) in injured and stressed ankles for both Cotton and Tap tests, with values of respectively, 6.2mm (CI, 5.8 to 6.7mm) and 6.1mm (CI, 5.7 to 6.6mm). The Cotton test had 73.3% sensitivity, 100% specificity, and 86.7% diagnostic accuracy. The Tap test had 70% sensitivity, 90% specificity, and 80% diagnostic accuracy.Conclusion:Our cadaveric study compared the Cotton and Tap tests for detection of coronal plane syndesmotic instability. Both tests demonstrated similar increases in TFCS measurements in stressed injured conditions when compared to intact and injured non-stressed conditions. Additionally, both tests demonstrated similar diagnostic accuracy for coronal plane syndesmotic instability, with slight favor for the Cotton test. In our experience, the Cotton test can be unreliable due to the difficulty in applying a steady distraction force while maintaining a perfect Mortise view. We recommend the Tap test as a more stable, controlled, and reproducible intraoperative diagnostic test for coronal plane syndesmotic instability.

General Calculation Method of Normal Stress on Cross Section of Combined Tension (Compression) Bending Deformation

Tension (compression) bending combined deformation is a commonly used combined deformation form in engineering. The current material mechanics textbooks use the superposition method to calculate the stress on the cross section of the combined deformed member, whose characteristics are simple and easy to grasp. However, the premise of superposition principle is that the internal force, stress, strain and displacement have a linear relationship with external force. If the above linear relationship cannot be guaranteed, the superposition principle cannot be applied. In this case, the stress-strain relationship must be used for calculation. Based on the assumption of plane and unidirectional force, in this paper, rods with arbitrary cross-sectional shape under arbitrary load were taken as the research object, and the general calculation methods of the stress on the cross-section during the combined deformation of tension and bending were studied. This paper aimed at expanding students’ thinking mode and improving students’ learning ability in the process of material mechanics teaching.

Comparison between cotton test and tap test for the assessment of coronal syndesmotic instability: A cadaveric study

IntroductionIn surgically treated rotational malleolar fractures, residual syndesmotic instability is typically assessed following fixation with the widely used intraoperative Cotton test. However, due to its dynamic nature, there are inconsistencies of the magnitude and direction of the distraction force when attempting to pull the fibula away from the tibia using a bone hook. The novel Tap test advances a cortical tap through a drilled hole in the fibula with a stable, unidirectional distraction force applied to the tibia. The objective of this cadaveric study was to compare the Cotton and Tap tests as diagnostic tools for coronal plane syndesmotic instability. MethodsTibiofibular Clear Space (TFCS) of 10 cadaveric specimens was measured for: intact, non-stressed; intact, stressed; injured, non-stressed; and injured, stressed (Tap and Cotton tests). In injured conditions, the syndesmotic ligamentous complex was sectioned using an anterolateral longitudinal approach. Perfect fluoroscopic Mortise images were acquired for all conditions. Two independent and blinded Orthopaedic Foot and Ankle Surgeons measured TFCS 1 cm proximal to the ankle joint line. Intra and interobserver reliabilities were assessed by Intraclass Correlation Coefficient. Syndesmotic TFCS values for all conditions were compared by paired Wilcoxon. Diagnostic performance of the Cotton and Tap tests was assessed using a relative increase of TFCS > 2 mm when comparing intact stressed and injured stressed conditions. P-values <0.05 were considered significant. ResultsThe intraclass correlation coefficient for intraobserver and interobserver reliability was respectively 0.96 and 0.79. TFCS measurements were similar in intact non-stressed, intact stressed (both Cotton and Tap tests) and injured non-stressed conditions, with mean values and 95% Confidence Intervals of: intact non-stressed, 3.5 mm; intact stressed, 3.6 mm (Cotton test) and 4.0 mm (Tap test); injured non-stressed, 3.8 mm. The Cotton test and Tap test had, respectively, 73.3% and 70% sensitivity, 100% and 90% specificity, 86.7% and 80% diagnostic accuracy. ConclusionsOur cadaveric study compared the Cotton and Tap tests for detection of coronal plane syndesmotic instability. Both tests demonstrated similar increases in the TFCS measurements in stressed injured conditions when compared to intact non-stressed and stressed conditions, as well as injured non-stressed conditions.

Observation and Control of Unidirectional Ballistic Dynamics of Nanoparticles at a Liquid-Gas Interface by 4D Electron Microscopy.

Understanding and controlling the dynamics of active Brownian objects far from equilibrium are fundamentally important for emerging technologies such as artificial micro/nanomotors for drug deliveries and noninvasive microsurgery. However, direct observation and control of unidirectional propulsion of individual nanoscale objects are technically challenging due to the required spatiotemporal resolution. Here, we report in situ visualization and manipulation of unidirectional superfast ballistic dynamics of a single-photon-activated gold nanoparticle (NP) along the liquid-gas interface by four-dimensional electron microscopy (4D EM) at nanometer and nanosecond scales. We observed that, upon repetitive femtosecond laser excitation, the NP at the liquid-gas interface exhibits a continuously superfast unidirectional translation with a linear dependence of its root mean squared velocity (νrms) on either the laser fluence or repetition rate. Under a single femtosecond pulse excitation, the NP exhibits a superfast ballistic translation at the nanosecond time scale. Combined experiment and physical modeling reveals that the superfast unidirectional, ballistic translation is driven by unidirectional random impulsive forces arising from the nanobubbles (NBs) induced by enhanced laser heating as a result of plasmonic excitation, which is controllable by tuning the laser characteristics. This directional plasmonic NB-propulsion mechanism sheds light on the design of light-controllable artificially intelligent micro/nanomotor systems.

Experimental cross-flow control in a 3D boundary layer by multi-discharge plasma actuators

In this work, we perform experimental studies on the electrophysical and aerodynamic characteristics of two multi-discharge actuator models using near-surface dielectric barrier discharge to generate a unidirectional volumetric force impact over an extended surface area. Flow control experiments are conducted on the 3D boundary layer of a swept plate with an induced longitudinal pressure gradient using the aforementioned models in a subsonic low-turbulence wind tunnel. The results confirm the possibility of significantly decreasing the cross flow velocity in the boundary layer and stationary vortex intensity attenuation of its instability, owing to the extended volumetric force impact generated by the multi-discharge actuator system.

Tsunami Deposits on a Paleoproterozoic Unconformity? The 2.2 Ga Yerrida Marine Transgression on the Northern Margin of the Yilgarn Craton, Western Australia

Large blocks and boulders of banded iron formations and massive hematite up to 40 × 27 × 6 m3 and in excess of 10,000 metric tonnes were detached from an outcrop of the Wilgie Mia Formation during the ca 2.20 Ga marine transgression at the base of the Paleoproterozoic Windplain Group and deposited in a broad band on the wave-cut surface 900 to 1200 m to the east. At the same time, sand and shingle were scoured from the sea floor, leaving remnants only on the western side of the Wilgie Mia Formation and on the eastern sides of the boulders. Evidence suggesting that the blocks were detached and transported and the sea floor scoured by a tsunami bore with a height of at least 40 m is provided by the following: (1) the deposition of the blocks indicates transportation by a unidirectional sub-horizontal force, whereas the smaller boulders are randomly oriented; (2) 900–1200 m separates the banded iron formation (BIF) outcrop and the blocks (3) there is an absence of the basal conglomerate between the blocks; (4) the blocks and boulders rest directly on the wave-cut surface of deeply weathered amphibolites; (5) the blocks and boulders are surrounded and overlain by fine-grained sandstone of the Windplain Group.

Characteristic load-elongation behavior of weak electrospun fiber texture

The main purpose of this research is to establish the characteristic load-displacement behavior of weak, planar, randomly oriented fiber bundles. In this paper unidirectional strain-controlled force measurements have been performed on brittle, randomly oriented fibrous scaffold, prepared by electrospinning from polysuccinimide (PSI) based polymers. We observed that the mechanical behavior of these weak 2D networks deviated significantly from that of traditional materials treated usually within the framework of continuum mechanics. These loading curves show a maximum type dependence due to damage formation that results in stiffness reduction at elongation. We are able to monitor the rupture formation by sensitive force measurements and study how evolution of the ruptures develops during elongation. On the basis of the Fiber Bundle Model, the loading force can be directly related to the cumulative probability distribution function of failures, appearing on the loading curve as abrupt force drops during extension. We are able to determine the sequence of rupture force during extension as well as the magnitude of force drops. Large number of failures observed on each loading curve, made possible to analyze the statistical properties of damage formation. We estimated the cumulative empirical distribution function of rupture force and analyzed them on the basis of Weibull distribution. The shape parameter of distribution proves that, the rupture force of polysuccinimide electrospun fiber bundles follows the exponential distribution function. This experimental technique can provide the initial stiffness, as well as to explain load bearing capacity of several synthetic and biological textures that are composed of fibers. It also suggests improved probabilistic approaches to the development of more sophisticated statistical models.

Design and Calibration of a Tri-Directional Contact Force Measurement System

In low pressure turbine stages, adjacent blades are coupled to each other at their tip by covers, called shrouds. Three-dimensional periodic contact forces at shrouds strongly affect the blade vibration level as energy is dissipated by friction. To validate contact models developed for the prediction of nonlinear forced response of shrouded blades, direct contact force measurement during dynamic tests is mandatory. In case of shrouded blades, the existing unidirectional and bi-directional contact force measurement methods need to be improved and extended to a tri-directional measurement of shroud contact forces for a comprehensive and more reliable validation of the shroud contact models. This demands an accurate and robust measurement solution that is compatible with the nature and orientation of the contact forces at blade shrouds. This study presents a cost effective and adaptable tri-directional force measurement system to measure static and dynamic contact forces simultaneously in three directions at blade shrouds during forced response tests. The system is based on three orthogonal force transducers connected to a reference block that will eventually be put in contact with the blade shroud in the test rig. A calibration process is outlined to define a decoupling matrix and its subsequent validation is demonstrated in order to evaluate the effectiveness of the measurement system to measure the actual contact forces acting on the contact.

Control of Cross-Flow in a Three-Dimensional Boundary Layer Using a Multidischarge Actuator System

Wind tunnel experiments on the control of flow in a three-dimensional boundary layer are performed using a multidischarge actuator system. The boundary layer was produced on a swept plate with an induced streamwise negative pressure gradient. The actuator system used a near-surface barrier discharge for producing a unidirectional three-dimensional force action over a lengthy region of the plate surface. The possibility of considerably reducing the cross-flow velocity and mitigating the intensity of stationary vortices that produce the cross-flow instability by means of the action of an actuator system is confirmed.

Stress distribution in tooth supported removable partial denture fabricated using two different materials: A 3-dimensional finite element analysis

A suitable material and design plays an important role in the fabrication of a removable prosthesis. The distribution of forces plays a significant role in preservation of the remaining structures especially the abutment teeth. In this study 2 models were prepared using, computed tomography (CT Scan) and 3-Dimensional construction software; of Kennedy’s Class 3 partially edentulous situation. The models were classified based on the material used in fabrication of the prosthesis as; Model 1- Cobalt Chromium denture; Model 2-Thermoplastic Nylon dentures. The meshing of the models was done using hyper mesh 13 and, the contact and constraint conditions were defined for the analysis model. The material properties were incorporated and the stress analysis was done by applying an unidirectional force of 40 N per tooth on three posterior teeth. The analysis was done using ANSYS version15 and the results were analyzed. Model 1 (cobalt chromium) showed a maximum displacement of 0.00718 mm and maximum stress of 19.87 MPa, Model 2 (Thermoplastic nylon) showed the maximum displacement of 0.0094 mm and maximum stress was 29.97 MPa. Within the limitations of this study the stress evaluation on different prosthetic materials revealed that the areas of maximum stress were seen on the palatal slopes of the maxillary residual ridge and on the anterior abutment tooth (canine) in both models. However, the Cobalt-Chromium model showed significantly lesser stress as compared to the Thermoplastic nylon model.

THE CORRELATION BETWEEN LOW BIRTHWEIGHT (LBW) WITH INFANT MORTALITY RATES (IMR) AND ANTENATAL CARE (ANC) IN EAST JAVA 2018

Nearly 15 % of babies worldwide are born with LBW. The proportion of LBW in East Java was 6.61% higher compared to nationwide 6.2% in 2018. The East Java ranked third for the highest IMR in Indonesia, LBW as the most significant cause (42%). One of determinants for birthweight is ANC. The proportion of the first ANC was 88.25%, and the complete ANC was 80.2% in East Java in 2018. The proportion of the province's complete ANC was lower than the national by 95.2%. This research is a secondary quantitative data analytic, sourced from the Health Profiles of East Java Province in 2018. This study aims to describe the strong correlation between LBW and IMR and ANC in the province of East Java using Pearson correlation analytic. The results showed that there was a correlation with influential and unidirectional forces between LBW and IMR. There was a correlation of moderate strength between the complete ANC visit and LBW. There wasn’t significant correlation between the first ANC and LBW. The government in East Java must make solution to increase complete ANC visit by searching the causes factors of low proportion of it.

RBF Neural Network-Based Supervisor Control for Maglev Vehicles on an Elastic Track With Network Time Delay

When the electromagnetic suspension (EMS) type maglev vehicle is traveling over a track, the airgap must be maintained between the electromagnet and the track to prevent contact with that track. Because of the open-loop instability of the EMS system, the current must be actively controlled to maintain the target airgap. However, the maglev system suffers from the strong nonlinearity, force saturation, track flexibility, and feedback signals with network time-delay, hence making the controller design even more difficult. In this article, the minimum levitation unit of the maglev vehicle system has been established. An amplitude saturation controller (ASC), which can ensure the generation of only saturated unidirectional attractive force, is thus proposed. The stability and convergence of the closed-loop signals are proven based on the Lyapunov method. Subsequently, ASC is improved based on the radial basis function neural networks, and a neural network-based supervisor controller (NNBSC) is thus designed. The ASC plays the main role in the initial stage. As the neural network learns the control trend, it will gradually transition to the neural network controller. Simulation results are provided to illustrate the specific merit of the NNBSC. The hardware experimental results of a full-scale IoT EMS maglev train are included to validate the effectiveness and robustness of the presented control method as regards to time delay.

Under-oil superhydrophilic TiO2/poly(sodium vinylphosphonate) nanocomposite for the separation of water from oil

Under-water superoleophobic filters lose their water separation capability if they are contaminated with oil. In contrast, an oil contaminant in a filter that is both superoleophobic underwater and superhydrophilic underoil can be readily displaced with water. Even after contamination by oil, such a filter can self-clean in water and re-create and maintain an integral water film in the pores to enable sustained water separation. Unfortunately, there have been only a few reported examples of under-oil superhydrophilic materials. We report herein a novel under-oil superhydrophilic material consisting of TiO2 nanoparticles that are coated by an excess of a sodium salt of poly(vinylphosphonic acid) (PVPA.nNa). This nanocomposite can be applied as a coating onto various substrates such as glass plate, glass wool, cotton ball, and stainless-steel metal mesh for permanent self-cleaning and hexadecane collection. More interestingly, a coated cotton ball could be affixed to the bottom end of a standing tube and allows the selective permeation of water from a stirred water/hexadecane mixture. Unfortunately, a coated metal mesh with larger pores and thus much higher water flux could not achieve the separation most likely because the weakness of the water film in the mesh pores induces a negative value of Laplace pressure. We achieve this separation for the coated metal mesh by attaching a thin electrospun superhydrophobic mat onto its lower side to thus yield a Janus filter. Our assumption is that the unidirectional upward water-pulling force of the Janus filter in this case helps to stabilize the water film in the metal mesh. Due to the facile synthesis of TiO2-PVPA·nNa and the demonstrated applications of the TiO2-PVPA·nNa coating, this study should inspire further research in high-flux filters for water separation from oil.

Modeling and Experimentation of the Unidirectional Orthodontic Force of Second Sequential Loop Orthodontic Archwire.

The abnormal tooth arrangement is one of the most common clinical features of malocclusion which is mainly caused by the tooth root compression malformation. The second sequential loop is mostly used for the adjusting of the abnormal tooth arrangement. Now, the shape devise of orthodontic archwire depends completely on the doctor's experience and patients' feedback, this practice is time-consuming, and the treatment effect is unstable. The orthodontic-force of the different parameters of the second sequence loop, including different cross-sectional parameters, material parameters, and characteristic parameters, was compared and simulated for the abnormal condition of root compression deformity. In this paper, the analysis and experimental study on the unidirectional orthodontic-force were carried out. The different parameters of the second sequential loop are analyzed, and the equivalent beam deflection theory is used to analyze the relationship between orthodontic-force and archwire parameters. Based on the structural analysis of the second sequential loop, the device for measuring orthodontic force has been designed. The orthodontic force with different structural characteristics of archwire was compared and was measured. Finally, the correction factor was developed in the unidirectional orthodontic-force forecasting model to eliminate the influence of inherent error. The average relative error rate of the theoretical results of the unidirectional orthodontic-force forecasting model is between 12.6% and 8.75%, which verifies the accuracy of the prediction model.